Teeeitoby



(No Model.)

M. T. SCARFF.

GOPYING PRESS.

No. 36'7,012. Paten-ted July 19, 1887.

77 2372 (omar fij /.J WC

UNITED STATES PATENT OFFICE.

MARK T. SCARFF, OF MICHIGAN CITY, 'DAKOTA TERRITORY, ASSIGNOR OF ONEHALF TO THERON XV. BEAN, OF SAME PLACE.

COPYlNG-PRESS.

SPECIFICATION orming part of Letters Patent No. 367.012, dated July 19, 1887.

I Application filed August 30, 1886. Serial No. 2l2,17l. (No model.)

To all whom, it mdy concern:

Be it known that I, MARK T. SOARFF, of Michigan City, in the connty of Nelson and Territory of Dakota, have invented certain 5 new 'and useful Inprovenents in Copying- Presses, of which the following is a specification.

My inventiou relates to certain improvements in th at class of presses that are designed ro particularly for copying letters; andit consists generally in constructing a press for this purpose in which the power or pressure is exerted by means of crank-actuated springs, the cranks being operated by levers that are partially revolved and allowed to pass the dead-center at both ends of the stroke, th uslocking the plateu both in its elevated and depressed positions.

My invention further consists in the construction and combination hereinafter described, and particularly pointed out in the claims.

In the drawings, which form a part of this specification, Figurel is a side elevation of my improved press, showing the levers in their position when the press is not in use. Fig 2 is a plan View of the same, and Fig. 3 is a longitudinal section showing the press in action.

2 represents the bed-plate of the press, preferably of rectangular form. It may be supported upon suitable legs, 4. y

6 is a platen, preferably of a form to correspond to that of the bed-plate.

8 S are U -shaped springs,which are altached at one end to the platen 6 and at the other to a crank-shaft, 10.

12 12 are adjustable standards,which are attached to the bed-plate and form bearings for the crank-shaft upon which the platen is supported. These are preferably made in two sections. The lower section is attached to the bed-plate and its end is provided with a lefthand screw-thread. The upper section has a hearing for the crank-shafts and its end is provided with a right-hand screw-thread.

15 is a double nut or turn-buckle screwthreaded to ,receive the right and left hand threaded ends of the standard 12.

The crank-aXles 10 are preferably provided with the handles or levers 16 (which levers are 0 preferably Secured to the said axles between the springs 8) and the cranks 18 outside of the bearings of said springs and terminating with the journals 19, which are mounted in bearings in the standards 12.

20 are guide pins or bolts attached to the bed-plate and extendng through the plateu for the purpose of keeping it in its proper position. Any suitable means may be used for guiding the platen.

22 is a support Secured to the platen 6, upon which the ends of the levers 10 rest when out of action. The levers 10 are provided with projections 2l, adapted to engage the springs and limit the outward movement of the said levers.

24c representsa letter-book in position in the press.

The operation is as follows: The book or other article or material is placed in position ou the bed-plate, as shown in Fig. 1. The levers l6 are grasped in the hand, raised, and thrown outward. This motion partially revolves the crank-shaft 10 and causes the cranks 18 tobe thrown downward and assume the position shown in Fig. 3,when the projections 21 strike the springs and prevent a further revolution. W'hen the levers are in this position, the said 'cranks have passed the dead-center and are locked by the upward tension of the springs. The springs 8 yield to the downward 8( movement of the crank, and not only allow for a varying thickness of the books, but give a more even and uniform pressure. NVhen the process of copying has been completed, the levers may be raised and thrown inward to 8 their original position, the crank-shafts revolved,and the cranks thrown upward,thereby raising the springs8and the platen 6, attached thereto. The levers may be revolved until they come in contact with the support 22,which limits their motion. The cranks have by this time passed the dead-center, and the tendency ot' the weight of the springs and platen is to hold the levers in this position upon the support.

By Operating thelevers from the center outward to give the pressure I avoid the necessity of fastening down the press, as the pressure is equally distributed upon both ends of the press, and the tendency is to hold itin place.

I do not confine nyself to any particular :oo

2. The conbination, in a press of the class described, with the bed-plate 2, of the standards 12 at' the opposite ends of the bed-plate, the erankshafts 10, having level-s 16, j ournaled in said standards, the platen 6, and the springs 8, Secured to said platen and to said crankshafts, substantially as described. e

In testimony whereof I have hereunto set my hand this 24th day of August, 1886.

MARK T. SGARFE In presence of- E. A. LAME, T. W. BEAN. 

